"Representation of Material Composition—Chemical Formula" PPT Courseware on Representation of Chemical Elements and Material Composition

Description

"Representation of Material Composition—Chemical Formula" PPT Courseware on Representation of Chemical Elements and Material Composition

learning target

1. Master chemical formulas and their meanings, and be able to use chemical formulas to express the composition of substances.

2. Understand the meaning of relative molecular mass and be able to use relative atomic mass to perform simple calculations.

1. The meaning of the element symbol “Fe”

2.What do Na NaCl CO2 H2 H2O mean?

1. Chemical formulas and writing of chemical formulas

1. Concept: Use a combination of element symbols and numbers to express the formula of material composition.

Such as: water H2O

Oxygen O2

carbon dioxide CO2

[Note] The composition of each pure substance is fixed, so there is only one chemical formula for a substance.

2. Meaning of expression

chemical formula

Macro

①Indicates a substance

②Indicates the elemental composition of the substance

microscopic

①A molecule of substance

②Molecular composition of matter

Note: Consider whether the particles that make up matter are molecules or atoms.

2. Simple calculation of material composition

1. Calculate relative molecular mass

Understanding relative molecular mass

The meaning of H2O: A water molecule is composed of 2 hydrogen atoms and 1 oxygen atom.

True mass: The mass of 1 water molecule = the mass of 2 hydrogen atoms + the mass of 1 oxygen atom

Relative molecular mass: relative molecular mass of 1 water molecule = relative atomic mass of 2 hydrogen atoms + relative atomic mass of 1 oxygen atom

Therefore, the relative molecular mass of H2O = 1×2+16×1=18

Definition: The sum of the relative atomic masses of the atoms in the chemical formula is the relative molecular mass.

2. Calculate the mass ratio of the constituent elements of matter

The mass ratio between elements = the ratio of the sum of the relative atomic masses of each atom

give it a try

1. Calculate the mass ratio of each element in H2O2 and Cu(OH)2.

2. Calculate the mass ratio of each element in NH4NO3.

Knowledge point 1. The meaning of chemical formulas

[Typical example 1] Formaldehyde (chemical formula: CHO) is one of the main pollutants in interior decoration. The following statement is correct ( )

A. Formaldehyde is composed of three elements: carbon, hydrogen, and oxygen.

B. Formaldehyde is composed of carbon atoms and water molecules

C. Formaldehyde molecules are composed of carbon atoms, hydrogen molecules, and oxygen atoms

D. Formaldehyde is composed of one carbon element, two hydrogen elements, and one oxygen element.

Knowledge point 2. Calculation of chemical formulas

[Typical Example 3] Vitamins are essential nutrients for the human body. The chemical formula of vitamin D2 is C28H44O.

Try calculation:

(1) The relative molecular mass of vitamin D2 is _______.

(2) The mass ratio of carbon, hydrogen, and oxygen in vitamin D2 is ________.

(3) The mass of carbon contained in 198g of vitamin D2 is _______g.

Intelligent training

1.Which chemical formula of the following substances is incorrect ( )

A. Magnesium oxide MgO2 B. Sodium oxide Na2O

C. Zinc sulfate ZnSO4 D. Copper hydroxide Cu(OH)2

2. May to July is the period of high incidence of hand, foot and mouth disease. Hand, foot and mouth disease is an infectious disease caused by enterovirus. It mostly occurs in children under 5 years old and can cause herpes on hands, feet, mouth and other parts of the body. The commonly used drug for the treatment of hand, foot and mouth disease is acyclovir (chemical formula: C8H11N5O3). Which of the following statements about acyclovir is incorrect ( )

A. Acyclovir is an organic compound

B． The mass ratio of the three elements C, H, N, and O in acyclovir is 8:11:5:3

C. The relative molecular mass of acyclovir is 225

D． There are 27 atoms in one molecule of this substance

3. Iodine has a great influence on the intellectual development of teenagers. Potassium iodate (KIO3) is usually added to iodized salt. The picture below is part of the text description on the label of a type of iodized salt sold in supermarkets.

please answer the following question:

(1) The mass ratio of potassium, iodine, and oxygen in potassium iodate is ____________.

(2) The mass of iodine in each bag of salt is _______mg.

(3) The Chinese Nutrition Society recommends that an 18-year-old youth consume 0.15 mg of iodine per day. Assuming that the only source of iodine is this iodized salt, the young man's daily intake of this salt should be _______g.

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For more information about the PPT courseware "Chemical Elements and Substance Compositions Representation of Substance Compositions Representation of Chemical Formulas", please click the Representation of Chemical Elements and Substance Compositions ppt Representation of Substance Compositions by Chemical Formulas ppt tag.

"Representation of Material Composition - Chemical Formula" Representation of Chemical Elements and Material Composition PPT Courseware 2:

"Representation of Chemical Formulas of Material Compositions" Representation of Chemical Elements and Material Compositions PPT Courseware 2 Learning Objectives 1. Understand chemical formulas and their meanings, master the chemical formulas of some common substances, and understand how to write and read chemical formulas; 2. Master the calculations related to chemical formulas. Knowledge requires...

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Update Time: 2024-11-22

This template belongs to Chemistry courseware Beijing Curriculum Reform Edition Ninth Grade Chemistry Volume 1 industry PPT template

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